/*!	 synfig/rendering/common/optimizer/optimizersurfacedestroy.cpp
**	 OptimizerSurfaceDestroy
**
**	......... ... 2015 Ivan Mahonin
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifdef USING_PCH
#	include "pch.h"
#else
#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#ifndef _WIN32
#include <unistd.h>
#include <sys/types.h>
#include <signal.h>
#endif

#include "optimizersurfacedestroy.h"

#include "../task/tasksurfacedestroy.h"

#endif

using namespace synfig;
using namespace rendering;

void
OptimizerSurfaceDestroy::insert_task(
    std::set<Surface::Handle> &destroyed_surfaces,
    const RunParams& params,
    Task::List::reverse_iterator &ri,
    const Task::Handle &task) const
{
    if (task
            && task->target_surface
            && !task->target_surface->is_created()
            && !destroyed_surfaces.count(task->target_surface)) {
        destroyed_surfaces.insert(task->target_surface);
        TaskSurfaceDestroy::Handle surface_destroy = new TaskSurfaceDestroy();
        surface_destroy->target_surface = task->target_surface;
        Task::List::iterator i(ri.base());
        i = params.list.insert(i, surface_destroy);
        ri = Task::List::reverse_iterator(i);
        apply(params);
    }
}

void
OptimizerSurfaceDestroy::run(const RunParams& params) const
{
    std::set<Surface::Handle> destroyed_surfaces;

    for (Task::List::reverse_iterator ri = params.list.rbegin(); ri != params.list.rend();) {
        if (*ri) {
            if (TaskSurfaceDestroy::Handle::cast_dynamic(*ri)) {
                if (destroyed_surfaces.count((*ri)->target_surface)) {
                    Task::List::iterator i(ri.base());
                    i = params.list.erase(i);
                    ri = Task::List::reverse_iterator(i);
                    continue;
                }

                destroyed_surfaces.insert((*ri)->target_surface);
            } else {
                for (std::vector<Task::Handle>::const_iterator j = (*ri)->sub_tasks.begin(); j != (*ri)->sub_tasks.end(); ++j) {
                    insert_task(destroyed_surfaces, params, ri, *j);
                }

                insert_task(destroyed_surfaces, params, ri, *ri);
            }
        }

        ++ri;
    }
}